Lecture 4

Question 1

The 3 main functions of mebranes are:

Answer 1

boundries

Regulators (selective permeability)

Intracellular transporters (vesicles)

Question 2

Simple diffusion is most effective when:

Answer 2

SA has a high ratio to Volume

Question 3

RAte of diffusion depends on

Answer 3

electrical charge, temperature, diameter, concentration gradient.

Question 4

Rate of a solute is dependent/independent of other solutes

Answer 4

independent

Question 5

Small, non polar, and uncharged particles

Answer 5

can diffuse across the membrane

Question 6

Water can/cannot pass the membrane

Answer 6

can (but slowly, aquaporins can increase rate)

Question 7

Osmosis:

Answer 7

Diffusion of water across a semi-permeable membrane

Question 8

Water follows ______

Answer 8

solutes

Question 9

High water -> low water

Answer 9

ye

Question 10

A hypertonic solution will cause a red blood cell to _____

Answer 10

shrink, it will pull water towards the ions in solution

Question 11

A hypotonic solution will cause a red blood cell to _____

Answer 11

swell/burst, the ions in the cell absorb too much water

Question 12

Active transport has two requirements:

Answer 12

Input of energy

Carrier protein to move it across membrane

Question 13

Facilitated diffusion includes:

Answer 13

gates controlled by ligands or voltage that open and allow solutes to move down their concentration gradient

Question 14

Uni-porter

Answer 14

moves in one direction

Question 15

Anti-porter

Answer 15

moves something in while moving something out

Question 16

Sym-porter

Answer 16

moves two things in

Question 17

______- Plasma membrane surrounds the extracellular material and invaginates, forming a vesicle

Answer 17

endocytosis

Question 18

____-material in vesicles is expelled (secreted) from a cell by fusion with the plasma membrane

Answer 18

exocytosis

Question 19

To respond to a cell signal, the cell:

Answer 19

must have specific receptors to react to the signal